The horizontally opposed layout gives the Subaru H6-3.0 powerplant inherent smoothness without the need for power-robbing balance shafts used in some V-6 engines. Liquid-filled engine mounts contribute to the smooth, quiet ride. The horizontally opposed design also provides a lower center of gravity which enhances handling and performance.

The new Subaru high-output H6-3.0 features an aluminum crankcase, double-overhead camshafts and four valves per cylinder. A direct ignition system uses an individual ignition coil for each cylinder, eliminating the need for a distributor and sparkplug wires. The engine displaces 2,999 cubic centimeters (183 cubic inches) and produces 212 horsepower at 6,000 rpm and 210 lb.-ft. of peak torque at 4,400 rpm. By 2,200 rpm, the Subaru H6-3.0 engine is already producing a substantial 174 lb.-ft. of torque, providing quick response at lower speeds.

The H6-3.0 produces nearly 30 percent more horsepower and torque than the 165-horsepower 2.5-liter H-4 in the Outback Limited model, yet is only 20 millimeters (0.8-inch) longer than that four-cylinder engine. Like all Subaru models the new Outback H6-3.0 models run on regular fuel, but 91 octane is recommended for maximum performance.

Dual-Stage Intake And Exhaust
The new Subaru H6-3.0 uses a variable intake manifold and a dual-stage muffler to optimize power delivery throughout the engine speed range. Low-speed and mid-range power have not been compromised for high-rpm power, and vice versa. The variable intake manifold features an induction control valve that provides two intake characteristics. Below 3,700 rpm the valve remains closed to create a long intake runner length, helping to boost low-end and mid-range power. When the valve opens above 3,700 rpm, the manifold creates a "scavenging" or light supercharging effect, allowing each cylinder to catch high-pressure waves of intake air bouncing off the opposite side of the manifold.

A mechanical valve in the rear muffler varies muffler volume to help enhance engine power in different speed ranges. At lower engine speeds (around-town driving, for example), the valve remains closed to provide a smaller-volume muffler chamber. The resulting level of exhaust back-pressure enhances power at these speeds. When exhaust pressure reaches about 22 psi -- which occurs at about 2,400 rpm -- the valve opens to allow exhaust gas through an additional chamber. The resulting increased muffler volume reduces exhaust back-pressure, enhancing power at higher speeds. Muffler valve operation does not affect the noise level.

 

I'd like to see a turboed or twin turboed version, and how much power that makes.:banana:

 

oh baby that would be nic.

 

"Subaru unveiled the new concept at Geneva... Very Alfa Romeo-esque. IMHO its ugly but the motor is a work of art. 3.0L Twin Turbo H6, 395hp over 400lb-ft of torque."

 

mmmmmmm that would be nice to have!!! I agree the car is kinda ugly, I think subaru could of done better.

 

looks like an 03 accord on steroids....

 

That my friend is the engine *supposedly* that will be used in the USDM Legacy STi when it comes out. Can you say M5?

 

the front end on that thing is hideous

 

I wonder if they'll ever try out an H8.... I doubt it though. The H6 Twin Turbo is gonna be sweeeet!

 

Maybe the old M5, I think the new ones will have a v10 not sure. It would deffinetly be able to take on a M3, or any other cars in that class. Hopefully if Subaru does bring the STi over they keep in a good price range.

 

Yea, they are talking about the new M5's having a V10 motor with 500 to 550 HP and being able to rev to like 9K RPM.